<!doctype html>

<html lang="en">
<head>
  <meta charset="utf-8">
  <title>green</title>
  <link rel="stylesheet" href="css/styles.css">
</head>
<body id="green-body">
  <button class="index" onclick="changePage('index')">index</button>
  <button class="red" onclick="changePage('red')">RED</button>
  <button class="green" onclick="changePage('green')">GREEN</button>
  <button class="blue" onclick="changePage('blue')">BLUE</button>

  <script src="js/scripts.js"></script>
</body>
</html>